Every CSI fan knows that forensic analysis is crucial to criminal investigations. But it’s not just microscopic blood spatter or clothing fibres that can help nail a perpetrator. Botanical forensics – identifying how long a fungus has grown on a dead body, or which species of pollen a victim has inhaled – can blow a case wide open too. We’re stepping into True Crime territory today as Professor David Gibson, author of Planting Clues, shares gruesome details of incredible real life criminal cases where forensic botany has nailed the killer. Buy Planting Clues through our affiliate bookshop and you’ll help fund WHY? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too. Every Monday and Thursday WHY? takes you on a wild adventure to the edge of knowledge. Follow on your favourite app so you never miss an episode. WHY? is written and presented by Emma Kennedy. Audio production by Jade Bailey. Artwork by James Parrett. Music by DJ Food. Exec Producer: Jacob Jarvis. Lead Producer: Anne-Marie Luff. Group Editor: Andrew Harrison. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices